linux-kernel - [PATCH rcu 09/12] rcu: Provide rcu_barrier_cb_is_done() to check rcu

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Message-Id: <20240816064921.57645-9-neeraj.upadhyay@kernel.org>
Date: Fri, 16 Aug 2024 12:19:18 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	paulmck@...nel.org,
	neeraj.upadhyay@...nel.org,
	neeraj.upadhyay@....com,
	boqun.feng@...il.com,
	joel@...lfernandes.org,
	urezki@...il.com,
	frederic@...nel.org
Subject: [PATCH rcu 09/12] rcu: Provide rcu_barrier_cb_is_done() to check rcu_barrier() CBs

From: "Paul E. McKenney" <paulmck@...nel.org>

This commit provides a rcu_barrier_cb_is_done() function that returns
true if the *rcu_barrier*() callback passed in is done.  This will be
used when printing grace-period debugging information.

Signed-off-by: "Paul E. McKenney" <paulmck@...nel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
---
 kernel/rcu/rcu.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 38238e595a61..caaed27e476b 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -255,6 +255,11 @@ static inline void debug_rcu_head_callback(struct rcu_head *rhp)
 		kmem_dump_obj(rhp);
 }
 
+static inline bool rcu_barrier_cb_is_done(struct rcu_head *rhp)
+{
+	return rhp->next == rhp;
+}
+
 extern int rcu_cpu_stall_suppress_at_boot;
 
 static inline bool rcu_stall_is_suppressed_at_boot(void)
-- 
2.40.1